Advisory: Uintas Area Mountains | Issued by Craig Gordon for February 18, 2013 - 5:23am |
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bottom line A MODERATE avalanche danger is found on steep, wind drifted mid and upper elevation terrain and human triggered avalanches are possible on leeward slopes facing the north half of the compass. In addition, there's a MODERATE danger of triggering an avalanche that breaks into deeper buried weak layers, particularly on steep shady slopes. LOW avalanche danger is found on low angle, wind sheltered terrain, where there are no steep slopes above or adjacent to where you're riding.
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special announcement
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current conditions Yesterday's cold front brought an inch or two of snow and winter like temperatures which hover in the low single digits across the region this morning. Skies are clear and north-northwest winds are blowing 10-15 mph along the high ridges from the North Slope through Mirror Lake. The south half of the range is still seeing gusts in the 20's. In any case, riding and turning conditions are a bit of a mixed bag up high, but many folks are finding great snow conditions in wind sheltered, shady terrain. Recent observations can be found here. Wondering why last winter was so crazy? Click here to watch the 2011-12 Utah Winter Review... an excellent recap of last years conditions.
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recent activity No new avalanche activity to report. Click here for recent observations from the region. |
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Winds were all over the place yesterday... first from the west-southwest with averages in the 30's and gusts in the 50's. Then, switching to the west-northwest around 5:00 and blowing steadily in the 20's and 30's. And finally, becoming north and northwesterly early this morning and dying down into the teens. While there wasn't a ton of loose snow available for transport, it never ceases to amaze me how winds can find snow in the most obscure places and whip up a fresh batch of wind slabs. That's gonna be today's most obvious and most predictable avalanche concern. Forming on the leeward side of upper elevation ridges and cross loaded in chutes and gullies, today's slabs won't be overly deep, widespread, or sensitive, but they do have the potential to take you for an unexpected ride. Today's slabs are found on slopes facing the north half of the compass. Look for and avoid fat looking, rounded pillows of snow, particularly if they sound hollow like a drum.
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We might've forgotten about them, but our problem child, the January facets, aren't going away anytime soon. As a matter of fact they've been having a great time partying in our shallow snowpack, growing weak and sugary, and getting cranky when we tease them. While not widespread, avalanches breaking into this nefariously tricky weak layer aren't out of the question. It's counter-intuitive, but some of our weakest snow is found mid slope in steep, shady terrain. Best way to avoid getting tricked is to tone your slope angles down and think about not only the snow you're riding in, but also the snow you're riding on. Strong snow on weak snow is a dangerous combination and it allows us to get well out onto the slope before triggering a slide. If you feel the bottom falling out from under your machine and you're track is sinking into weak sugary snow that's a big red flag. While not huge, this slide clearly shows the January facets still alive and well. This slide was triggered on the 13th on a steep north facing slope in upper Whitney Basin at about 10, 400' in elevation. If you ever have questions about avalanche conditions on the North Slope... hit this guy up. Ted Scroggin knows the place like no other. Here, Ted takes a look at our pit results which failed on the January facets. The ECT column propagated with 22 taps, producing a Q1 shear. This tells us the snowpack needs a bit of a thump, but has the potential to break as a slab and with energy. Bottom line... it's a bit of a red flag. |
weather Sunny skies, light northerly winds, and cool daytime highs only reaching into the 20's are on tap for Presidents Day. Southwest winds pick up tonight ahead of the next storm system which is expected to arrive Tuesday night. Light snow should begin late Tuesday and become more intense Wednesday through Wednesday night. Periods of light snow then continue before another round of heavier snow and colder air impacts the area on Saturday. An active weather pattern stays with us through the end of the month. |
general annoucements Remember your information can save lives. If you see anything we should know about, please participate in the creation of our own community avalanche advisory by submitting snow and avalanche conditions. You can call me directly at 801-231-2170, email [email protected], or email by clicking HERE This is a great time of year to schedule a free avalanche awareness presentation for your group or club. You can contact me at 801-231-2170 or email [email protected] Donate to your favorite non-profit –The Friends of the Utah Avalanche Center. The UAC depends on contributions from users like you to support our work. The information in this advisory is from the US Forest Service which is solely responsible for its content. This advisory describes general avalanche conditions and local variations always occur. The information in this advisory expires 24 hours after the date and time posted, but will be updated by 7:00 AM Wednesday February 20th. |